US5319944A - Engine drive air conditioner - Google Patents
Engine drive air conditioner Download PDFInfo
- Publication number
- US5319944A US5319944A US08/092,513 US9251393A US5319944A US 5319944 A US5319944 A US 5319944A US 9251393 A US9251393 A US 9251393A US 5319944 A US5319944 A US 5319944A
- Authority
- US
- United States
- Prior art keywords
- engine
- air conditioner
- driven
- minimum power
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/44—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger characterised by the use of internal combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
Definitions
- the present invention relates to an engine driven air conditioner.
- an air conditioning is established in such a manner that an indoor temperature is adjusted to a temperature which is set by a user.
- an engine is driven on the basis of the current indoor temperature, the set temperature, and other factors.
- the conventional air conditioner if the current temperature exceeds the set temperature as a result of the air conditioning, the engine is temporarily stopped. If the set temperature is too large relative to the current indoor temperature before the start of the air conditioning, excess air conditioning is established, which results in discomfort to the user.
- the set temperature is not so high relative to the current indoor temperature before the start of the air conditioning, the set temperature is quickly approached as a result of the air conditioning, thereby stopping the engine soon after establishment of the air conditioning. Thus, frequent repetitive stopping and starting of the engine results, which is not desirable.
- an engine driven air conditioner for adjusting a temperature of an inner space of a room, which comprises a coolant circuit having a compressor, a condenser, an expansion device and an evaporator, an engine for driving the compressor, and a control device for controlling the coolant circuit and the engine in such a manner that the engine is driven at its minimum power or at a power other than the minimum power.
- the engine is stopped if the temperature exceeds a first set value while the engine is being driven at the minimum power, the engine is stopped if the temperature exceeds a second set value which is less than the first set value while the engine is being driven after the minimum power operation, and the engine is driven at the minimum power when the engine is re-started after a temporary stop of the engine.
- FIG. 1 show a structure of an engine driven air conditioner in accordance with the present invention.
- FIGS. 2 through 6 are flow-charts showing operation of an engine driven air conditioner.
- an engine driven air conditioner 10 includes an outdoor device 11 and an indoor device 50.
- the outdoor device 11 has an inner space provided with a partition 14 which defines an engine chamber 12 and a heat-exchanger chamber 13.
- Each compressor 21 is provided in a coolant circuit 41.
- an oil separator 22 In the engine room 12, there are accommodated an oil separator 22, a four-way valve 23, an accumulator 24, a one-way bridge 25, a receiver 26, and an expansion valve 27 which constitute the coolant circuit 41.
- the four-way valve 23 is used for bringing the air conditioner 10 from a cooling mode into a heating mode and vice versa.
- the expansion valve 27 is set to be adjusted on the basis of the temperature and pressure of a coolant at an intake side of the accumulator 24 which is disposed in the coolant circuit 41.
- a sensor 28 which is in the form of a cylinder is provided at the intake side of the accumulator 24. Oil separated from the coolant at the oil separator 22 is returned via a conduit 29 to each of the compressors 21.
- a fan 38 which is driven by a motor 37 establishes a heat-exchange between the coolant and the outdoor air.
- the outdoor heat-exchanger 35 is used as a condenser and an evaporator when the air conditioner 10 is in the cooling mode and the heating mode, respectively.
- the indoor device 50 is installed within a room 42 and has an indoor heat-exchanger 51 and a radiator 52. It is to be noted that indoor heat-exchanger 51 is used as a condenser and an evaporator when the air conditioner 10 is in the heating mode and the cooling mode, respectively.
- a fan 53 promotes a heat exchange between the outdoor air and an indoor air in such a manner that the indoor air taken into an inlet 54 is brought into heat-exchange with the coolant at the indoor heat-exchanger 51 and the radiator 52, and the resultant air is fed into the room 42 via an outlet 55.
- the inlet 54 is in fluid communication via a conduit 58 with a port 45 for introducing indoor air and a port 57 for introducing outdoor air.
- a valve 59 for controlling fluid flow in the conduit 58.
- each arrow along the coolant circuit 41 denotes a fluid-flow direction of the coolant.
- the overall operation of the air conditioner 10 is under the control of an electric controller 15 which is at a side of the outdoor device 11.
- the controller 15 is expected to receive information from each component of the air conditioner 10 and a remote controller 16 handled by an operator or user within the room 42.
- An explanation of operation of the coolant circuit 40 will be omitted due to the fact that it is well-known.
- Tset set temperature issued from the remote controller 16
- OPTset real operation temperature
- dT absolute value of a difference between room temperature and real operation temperature
- dTold absolute value of a difference between room temperature and real operation temperature when immediately preceding real operation
- dTnew absolute value of a difference between room temperature and real operation temperature when current preceding real operation
- Tmch time duration at which mode switching is inhibited
- step S001 when an on-off switch of the remote controller 16 is turned on for initiating operation of the air conditioner 10, the remote controller 16 is brought into activation at step S001, thereby starting the control of the air conditioner 10.
- step S002 it is judged whether the mode issued from the remote controller 16 is the ventilation mode. It is to be noted that other than the ventilation mode, there is an auto operation ("Auto"), a heating mode ("Heat”), and a cooling mode ("Cool").
- Auto auto operation
- Heat heating mode
- Cool cooling mode
- step S003 if the ventilation mode is recognized, the control proceeds to step S003 for ventilation operation. If no ventilation mode is recognized at step S002, the control proceeds to step S101 (FIG. 3). It is to be noted that when one of the set conditions is changed by the remote controller 16 the resultant condition always interrupts the control at step S004.
- step S101 it is determined whether a re-start inhibition timer is in the on condition.
- the control proceeds to step S201 (FIG. 4) at which OPMod and OPTset are set to be zero.
- step S202 the engine 20 remains at rest.
- step S105 if the Mode is not Auto, the control proceeds to step S112 in order to check whether Mode is Heat. If it is not, steps S107 and S108 are executed as mentioned above. If the Mode is Heat, steps S110 and S111 are executed as mentioned above.
- step S108 Upon completion of the execution of step S108 or step S111, the control proceeds to step S203 (FIG. 4) in order to check whether the condition formula (3) of dT>T1 is valid or satisfied. If it is not satisfied, due to the fact that Troom is nearly equal to Tset, step S202 is executed for stopping the engine 20. If the condition formula is satisfied at step S204, the required load value is calculated, and at step S205 the period timer for the required load value calculation is initiated.
- Step S206, step S207, and step S208 are executed in a loop manner for establishing the ordinary operation of the air conditioner 10.
- the required load value calculations are intermittently established. That is to say, at step S206, the air conditioner 10 is driven under a condition that the rotational number of the engine 20 is variable.
- the operation mode (OPMode) of the air conditioner 10 has been set at step S108 or step S111.
- step S207 it is determined whether at least one of the following condition formulas (4) and (5) is valid or satisfied.
- T2 is a minus value indicating excess heating
- T3 is a minus value indicating excess cooling. Due to the fact that the absolute value of T2 is less than the absolute value of T3, a condition under which dT ⁇ T2 is more excessive than another condition under which dT ⁇ T3 in a cooling operation.
- Tset is attained, which means that the engine 20 can be stopped, and at step 202 the engine 20 is stopped. It is to be noted that since T2 is small if the engine 20 is stopped immediately upon establishment of dT ⁇ T2 frequent repetitive starting and stopping of the engine 20 is induced which is not desirable.
- the engine 20 remains in operation during a minimum operation time duration which is regulated by Tmio.
- the absolute value of T3 is relatively large, which fails to induce frequent repetitive starting and stopping of the engine 20 even though the engine 20 is stopped upon establishment of dT ⁇ T3.
- step S208 is executed to determine whether the required load value is less than the minimum power of the engine power control. If the result of step S208 is no, the control returns to step S206. If the result is yes, the control proceeds to step S301 (FIG. 5).
- step S302 is executed whose function is identical to that of step S207.
- Tset is attained, which permits the stopping of the engine 20.
- step S303 is executed.
- step S202 is executed for stopping the engine 20. If the determination in step S304 is no, the control proceeds to step S305. At step S305, it is checked whether at least one of the following formulas (8) and (9) is valid or established.
- each of T5 and T10 is a plus value of a temperature which requires air conditioning.
- the absolute value of T5 is less than the absolute value of T10, the necessity of air conditioning at a condition under which dT>T10 is larger than that at another condition under which dT>T5. If either the condition formula (8) or (9) is valid or satisfied, Tset is not attained which means that normal operation control is required. Then, the control proceeds to step S209 in order to estimate a potential power of the air conditioner 10 under the current operation conditions, and returns to the foregoing normal operation control loop from step S205. Upon establishment of dt>T5, this means that Troom is less than Tset by at least T5.
- Troom becomes Tset soon, which results in frequent repetitive starting and stopping of the engine 20 or return to the minimum power operation control loop.
- Tjud which is in UP
- the engine 20 is being driven.
- Troom is less than Tset by at least T10 whose absolute value is relatively large. Sufficient difference lies between Troom and Tset, which fails to induce frequent repetitive starting and stopping of the engine 20 or return to the minimum power operation control loop.
- step S209 in order to estimate a potential power of the air conditioner 10 under the current operation conditions, and returns to the foregoing normal operation control loop from step S205.
- step S305 the control returns to step S301 for repeating the minimum power operation control loop.
- step S102 (FIG. 3) is executed and thereafter the foregoing procedures are performed. If false or at least one of the foregoing four conditions is invalid, step S404 is executed in order to determine whether the following condition formula (13) is valid or not.
- step S202 for stopping the engine 20. If true, step S202 is executed for maintaining the engine 20 at rest.
- step S202 for stopping the engine 20. Since T7>T9, Tout is lower when the control is within the minimum power operation mode than when the engine 20 is being stopped. Thus, while the engine 20 is being stopped, sufficiently higher Tout is required in order to re-start the engine 20. If the condition formula (15) is not satisfied, the control proceeds to step S301 (FIG. 5) in order to execute the minimum power operation.
- step S301 in FIG. 5 the minimum power operation (cf. step S301 in FIG. 5) is established in principle except for the false decision at step S402 and the true decision at step S403.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Human Computer Interaction (AREA)
- Mathematical Physics (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Air Conditioning Control Device (AREA)
Abstract
Description
|T3 (first set value)|>|T2 (second set value)|
T8>T6, T7>T9
|T10|>|T5|
Troom>(Tset+T1+Toffset) where T is a constant (1)
Troom<Tset-T1-Toffset (2)
(dt<T2) & (Tmio!=ON) (4)
dT<T3 (5)
Tout>T8 (6)
Tout<T9 (7)
(dT>T5) & (Tjud=UP) (8)
dT>T10 (9)
Mode=Auto
dTold-dTnew>0 condition formula (10)
Tmch!=ON condition formula (11)
dT<T4 condition formula (12)
dT≧T5 condition formula (13)
Tout>T6 condition formula (14)
Tout<T7 condition formula (15)
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4-190853 | 1992-07-17 | ||
JP4190853A JPH0634210A (en) | 1992-07-17 | 1992-07-17 | Engine-driven type air conditioner |
Publications (1)
Publication Number | Publication Date |
---|---|
US5319944A true US5319944A (en) | 1994-06-14 |
Family
ID=16264866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/092,513 Expired - Lifetime US5319944A (en) | 1992-07-17 | 1993-07-16 | Engine drive air conditioner |
Country Status (2)
Country | Link |
---|---|
US (1) | US5319944A (en) |
JP (1) | JPH0634210A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6463749B2 (en) * | 2000-12-08 | 2002-10-15 | Denso Corporation | Air-conditioning device for a vehicle and device for controlling an engine for a vehicle |
US20050035657A1 (en) * | 2003-07-31 | 2005-02-17 | Keiv Brummett | Vehicle auxiliary power unit, assembly, and related methods |
US6932148B1 (en) | 2002-10-07 | 2005-08-23 | Scs Frigette | Vehicle heating and cooling system |
US7150159B1 (en) | 2004-09-29 | 2006-12-19 | Scs Frigette | Hybrid auxiliary power unit for truck |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5018362A (en) * | 1988-11-28 | 1991-05-28 | Nippondenso Co., Ltd. | Apparatus for controlling automotive air conditioner |
US5168713A (en) * | 1992-03-12 | 1992-12-08 | Thermo King Corporation | Method of operating a compartmentalized transport refrigeration system |
US5199272A (en) * | 1992-06-04 | 1993-04-06 | Nippondenso Co., Ltd. | Idling speed control system |
-
1992
- 1992-07-17 JP JP4190853A patent/JPH0634210A/en active Pending
-
1993
- 1993-07-16 US US08/092,513 patent/US5319944A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5018362A (en) * | 1988-11-28 | 1991-05-28 | Nippondenso Co., Ltd. | Apparatus for controlling automotive air conditioner |
US5168713A (en) * | 1992-03-12 | 1992-12-08 | Thermo King Corporation | Method of operating a compartmentalized transport refrigeration system |
US5199272A (en) * | 1992-06-04 | 1993-04-06 | Nippondenso Co., Ltd. | Idling speed control system |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6463749B2 (en) * | 2000-12-08 | 2002-10-15 | Denso Corporation | Air-conditioning device for a vehicle and device for controlling an engine for a vehicle |
US6932148B1 (en) | 2002-10-07 | 2005-08-23 | Scs Frigette | Vehicle heating and cooling system |
US20050035657A1 (en) * | 2003-07-31 | 2005-02-17 | Keiv Brummett | Vehicle auxiliary power unit, assembly, and related methods |
US7259469B2 (en) | 2003-07-31 | 2007-08-21 | Scs Frigette Inc. | Vehicle auxiliary power unit, assembly, and related methods |
US7150159B1 (en) | 2004-09-29 | 2006-12-19 | Scs Frigette | Hybrid auxiliary power unit for truck |
Also Published As
Publication number | Publication date |
---|---|
JPH0634210A (en) | 1994-02-08 |
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